Double limits understood visually https://projecteuclid.org/journals/bulletin-of-the-american-mathematical-society/volume-3/issue-2/A-geometrical-method-for-th

Double limits understood visually https://projecteuclid.org/journals/bulletin-of-the-american-mathematical-society/volume-3/issue-2/A-geometrical-method-for-the-treatment-of-uniform-convergence-and/bams/1183414795.pdf https://projecteuclid.org/journals/bulletin-of-the-american-...